/*
 * contrib/btree_gist/btree_int4.c
 */
#include "postgres.h"
#include "knl/knl_variable.h"

#include "btree_gist.h"
#include "btree_utils_num.h"

typedef struct int32key {
    int32 lower;
    int32 upper;
} int32KEY;

/*
** int32 ops
*/
PG_FUNCTION_INFO_V1(gbt_int4_compress);
PG_FUNCTION_INFO_V1(gbt_int4_union);
PG_FUNCTION_INFO_V1(gbt_int4_picksplit);
PG_FUNCTION_INFO_V1(gbt_int4_consistent);
PG_FUNCTION_INFO_V1(gbt_int4_distance);
PG_FUNCTION_INFO_V1(gbt_int4_penalty);
PG_FUNCTION_INFO_V1(gbt_int4_same);

extern "C" Datum gbt_int4_compress(PG_FUNCTION_ARGS);
extern "C" Datum gbt_int4_union(PG_FUNCTION_ARGS);
extern "C" Datum gbt_int4_picksplit(PG_FUNCTION_ARGS);
extern "C" Datum gbt_int4_consistent(PG_FUNCTION_ARGS);
extern "C" Datum gbt_int4_distance(PG_FUNCTION_ARGS);
extern "C" Datum gbt_int4_penalty(PG_FUNCTION_ARGS);
extern "C" Datum gbt_int4_same(PG_FUNCTION_ARGS);

static bool gbt_int4gt(const void* a, const void* b)
{
    return (*((const int32*)a) > *((const int32*)b));
}
static bool gbt_int4ge(const void* a, const void* b)
{
    return (*((const int32*)a) >= *((const int32*)b));
}
static bool gbt_int4eq(const void* a, const void* b)
{
    return (*((const int32*)a) == *((const int32*)b));
}
static bool gbt_int4le(const void* a, const void* b)
{
    return (*((const int32*)a) <= *((const int32*)b));
}
static bool gbt_int4lt(const void* a, const void* b)
{
    return (*((const int32*)a) < *((const int32*)b));
}

static int gbt_int4key_cmp(const void* a, const void* b)
{
    int32KEY* ia = (int32KEY*)(((const Nsrt*)a)->t);
    int32KEY* ib = (int32KEY*)(((const Nsrt*)b)->t);

    if (ia->lower == ib->lower) {
        if (ia->upper == ib->upper)
            return 0;

        return (ia->upper > ib->upper) ? 1 : -1;
    }

    return (ia->lower > ib->lower) ? 1 : -1;
}

static float8 gbt_int4_dist(const void* a, const void* b)
{
    return GET_FLOAT_DISTANCE(int4, a, b);
}

static const gbtree_ninfo tinfo = {gbt_t_int4,
    sizeof(int32),
    gbt_int4gt,
    gbt_int4ge,
    gbt_int4eq,
    gbt_int4le,
    gbt_int4lt,
    gbt_int4key_cmp,
    gbt_int4_dist};

PG_FUNCTION_INFO_V1(int4_dist);
extern "C" Datum int4_dist(PG_FUNCTION_ARGS);
Datum int4_dist(PG_FUNCTION_ARGS)
{
    int4 a = PG_GETARG_INT32(0);
    int4 b = PG_GETARG_INT32(1);
    int4 r;
    int4 ra;

    r = a - b;
    ra = Abs(r);

    /* Overflow check. */
    if (ra < 0 || (!SAMESIGN(a, b) && !SAMESIGN(r, a)))
        ereport(ERROR, (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE), errmsg("integer out of range")));

    PG_RETURN_INT32(ra);
}

/**************************************************
 * int32 ops
 **************************************************/

Datum gbt_int4_compress(PG_FUNCTION_ARGS)
{
    GISTENTRY* entry = (GISTENTRY*)PG_GETARG_POINTER(0);
    GISTENTRY* retval = NULL;

    PG_RETURN_POINTER(gbt_num_compress(retval, entry, &tinfo));
}

Datum gbt_int4_consistent(PG_FUNCTION_ARGS)
{
    GISTENTRY* entry = (GISTENTRY*)PG_GETARG_POINTER(0);
    int32 query = PG_GETARG_INT32(1);
    StrategyNumber strategy = (StrategyNumber)PG_GETARG_UINT16(2);

    bool* recheck = (bool*)PG_GETARG_POINTER(4);
    int32KEY* kkk = (int32KEY*)DatumGetPointer(entry->key);
    GBT_NUMKEY_R key;

    /* All cases served by this function are exact */
    *recheck = false;

    key.lower = (GBT_NUMKEY*)&kkk->lower;
    key.upper = (GBT_NUMKEY*)&kkk->upper;

    PG_RETURN_BOOL(gbt_num_consistent(&key, (void*)&query, &strategy, GIST_LEAF(entry), &tinfo));
}

Datum gbt_int4_distance(PG_FUNCTION_ARGS)
{
    GISTENTRY* entry = (GISTENTRY*)PG_GETARG_POINTER(0);
    int32 query = PG_GETARG_INT32(1);

    int32KEY* kkk = (int32KEY*)DatumGetPointer(entry->key);
    GBT_NUMKEY_R key;

    key.lower = (GBT_NUMKEY*)&kkk->lower;
    key.upper = (GBT_NUMKEY*)&kkk->upper;

    PG_RETURN_FLOAT8(gbt_num_distance(&key, (void*)&query, GIST_LEAF(entry), &tinfo));
}

Datum gbt_int4_union(PG_FUNCTION_ARGS)
{
    GistEntryVector* entryvec = (GistEntryVector*)PG_GETARG_POINTER(0);
    void* out = palloc(sizeof(int32KEY));

    *(int*)PG_GETARG_POINTER(1) = sizeof(int32KEY);
    PG_RETURN_POINTER(gbt_num_union((GBT_NUMKEY*)out, entryvec, &tinfo));
}

Datum gbt_int4_penalty(PG_FUNCTION_ARGS)
{
    int32KEY* origentry = (int32KEY*)DatumGetPointer(((GISTENTRY*)PG_GETARG_POINTER(0))->key);
    int32KEY* newentry = (int32KEY*)DatumGetPointer(((GISTENTRY*)PG_GETARG_POINTER(1))->key);
    float* result = (float*)PG_GETARG_POINTER(2);

    penalty_num(result, origentry->lower, origentry->upper, newentry->lower, newentry->upper);

    PG_RETURN_POINTER(result);
}

Datum gbt_int4_picksplit(PG_FUNCTION_ARGS)
{
    PG_RETURN_POINTER(
        gbt_num_picksplit((GistEntryVector*)PG_GETARG_POINTER(0), (GIST_SPLITVEC*)PG_GETARG_POINTER(1), &tinfo));
}

Datum gbt_int4_same(PG_FUNCTION_ARGS)
{
    int32KEY* b1 = (int32KEY*)PG_GETARG_POINTER(0);
    int32KEY* b2 = (int32KEY*)PG_GETARG_POINTER(1);
    bool* result = (bool*)PG_GETARG_POINTER(2);

    *result = gbt_num_same((GBT_NUMKEY*)b1, (GBT_NUMKEY*)b2, &tinfo);
    PG_RETURN_POINTER(result);
}
